3 The rule parsing happens now in the daemon once at startup, all udev
4 event processes inherit the already parsed rules from the daemon.
5 It is shipped with SUSE10.0 and reduces heavily the system load at
8 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
9 device. Libsysfs is changed to "translate" the requested link into the
10 real device path, as it would happen with the hotplug event. Otherwise
11 device removal and the udev database will not work.
13 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
16 A few improvements for vol_id, the filesytem probing code.
20 Fix a stupid typo in extras/run_directory for "make install".
22 scsi_id creates the temporary devnode now in /dev for usage with a
23 non-writable /tmp directory.
25 The uevent kernel socket buffer can carry app. 50.000 events now,
26 let's see who can break this again. :)
28 The upcoming kernel will have a new input driver core integration.
29 Some class devices are now symlinks to the real device. libsysfs
30 needs a fix for this to work correctly. Udevstart of older udev
31 versions will _not_ create these devices!
35 Fix a 'install' target in the Makefile, that prevents EXTRAS from
40 A bunch of mostly trivial bugfixes. From now on no node name or
41 symlink name can contain any character than plain whitelisted ascii
42 characters or validated utf8 byte-streams. This is needed for the
43 /dev/disk/by-label/* links, cause we import untrusted data and
44 export it to the filesystem.
48 More bugfixes. If udevd was started from the kernel, we don't
49 have stdin/stdout/stderr, which broke the forked tools in some
54 Bugfix. udevstart event ordering was broken for a long time.
55 The new run_program() uncovered it, cause /dev/null was not
56 available while we try to run external programs.
57 Now udevstart should create it before we run anything.
61 Minor bugfixes and some distro rules updates. If you don't have the
62 persistent disk rules in /dev/disk/by-*/* on your distro, just
67 We can use socket communication now to pass events from udev to
69 RUN+="socket:/org/freedesktop/hal/udev_event"
70 will pass the whole udev event to the HAL daemon without the need
71 for a forked helper. (See ChangeLog for udevmonitor, as an example)
75 Mostly bugfixes and see ChangeLog.
77 The test for the existence of an environment value should be
79 ENV{KEY}=="*" to ENV{KEY}=="?*"
80 cause "*" will not fail anymore, if the key does not exist or
85 Bugfixes and a few tweaks described in the ChangeLog.
89 Mostly a Bugfix release.
91 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
92 timing with custom rules.
96 We changed the internal rule storage format. Our large rule files took
97 2 MB of RAM, with the change we are down to 99kB.
99 If the device-node has been created with default name and no symlink or
100 options are to remenber, it is not longer stored in the udevdb. HAL will
101 need to be updated to work correctly with that change.
103 To overrride optimization flags, OPTFLAGS may be used now.
111 Major changes happened with this release. The goal is to take over the
112 complete kernel-event handling and provide a more efficient way to dispatch
113 kernel events. Replacing most of the current shell script logic and the
114 kernel forked helper with a netlink-daemon and a rule-based event handling.
116 o udevd listens to netlink events now. The first valid netlink event
117 will make udevd ignore any message from udevsend that contains a
118 SEQNUM, to avoid duplicate events. The forked events can be disabled
120 echo "" > /proc/sys/kernel/hotplug
121 For full support, the broken input-subsytem needs to be fixed, not to
122 bypass the driver core.
124 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
125 removed from udev itself and must be emulated by calling small
126 helper binaries provided in the extras folder:
127 make EXTRAS=extras/run_directory/
128 will build udev_run_devd and udev_run_hotplugd, which can be called
129 from a rule if needed:
130 RUN+="/sbin/udev_run_hotplugd"
131 The recommended way to handle this is to convert all the calls from
132 the directories to explicit udev rules and get completely rid of the
133 multiplexing. (To catch a ttyUSB event, you now no longer need to
134 fork and exit 300 tty script instances you are not interested in, it
135 is just one rule that matches exactly the device.)
137 o udev handles now _all_ events not just events for class and block
138 devices, this way it is possible to control the complete event
139 behavior with udev rules. Especially useful for rules like:
140 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
142 o As used in the modalias rule, udev supports now textual
143 substitution placeholder along with the usual format chars. This
144 needs to be documented, for now it's only visible in udev_rules_parse.c.
146 o The rule keys support now more operations. This is documented in the
147 man page. It is possible to add values to list-keys like the SYMLINK
148 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
149 Also "final"-assignments are supported by using KEY:="value", which will
150 prevent changing the key by any later rule.
152 o kernel 2.6.12 has the "detached_state" attribute removed from
153 sysfs, which was used to recognize sysfs population. We switched that
154 to wait for the "bus" link, which is only available in kernels after 2.6.11.
155 Running this udev version on older kernels may cause a short delay for
158 o To provide infrastructure for persistent device naming, the id programs:
159 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
160 to export the probed data in environment key format:
161 pim:~ # /sbin/ata_id --export /dev/hda
162 ID_MODEL=HTS726060M9AT00
163 ID_SERIAL=MRH401M4G6UM9B
167 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
168 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
171 kay@pim:~> tree /dev/disk
174 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
175 | `-- IBM-Memory_Key -> ../../sda
177 | |-- swap -> ../../hda1
178 | |-- date -> ../../sda1
179 | `-- home -> ../../hda3
181 |-- 2E08712B0870F2E7 -> ../../hda3
182 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
183 |-- E845-7A89 -> ../../sda1
184 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
186 The IMPORT= operation will import these keys in the environment and make
187 it available for later PROGRAM= and RUN= executed programs. The keys are
188 also stored in the udevdb and can be queried from there with one of the
191 o A few binaries are silently added to the repository, which can be used
192 to replay kernel events from initramfs instead of using coldplug. udevd
193 can be instructed now to queue-up events while the stored events from
194 initramfs are filled into the udevd-queue. This code is still under
195 development and there is no documentation now besides the code itself.
196 The additional binaries get compiled, but are not installed by default.
198 o There is also a temporary fix for a performance problem where too many
199 events happen in parallel and every event needs to parse the rules.
200 udev can now read precompiled rules stored on disk. This is likely to be
201 replaced by a more elegant solution in a future udev version.
205 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
206 Fix for libsysfs not to expect this file was added.
210 All rules are applied now, but only the first matching rule with a NAME-key
211 will be applied. All later rules with NAME-key are completely ignored. This
212 way system supplied symlinks or permissions gets applied to user-defined
216 Please check your rules setup, if you may need to add OPTIONS="last_rule"
217 to some rules, to keep the old behavior.
219 The rules are read on "remove"-events too. That makes is possible to match
220 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
221 instruct udev to ignore an event (OPTIONS="ignore_device").
222 The new ACTION-key may be used to let a rule act only at a "remove"-event.
224 The new RUN-key supports rule-based execution of programs after device-node
225 handling. This is meant as a general replacement for the dev.d/-directories
226 to give fine grained control over the execution of programs.
228 The %s{}-sysfs format char replacement values are searched at any of the
229 devices in the device chain now, not only at the class-device.
231 We support log priority levels now. The value udev_log in udev.conf is used
232 to determine what is printed to syslog. This makes it possible to
233 run a version with compiled-in debug messages in a production environment
234 which is sometimes needed to find a bug.
235 It is still possible to supress the inclusion of _any_ syslog usage with
236 USE_LOG=false to create the smallest possible binaries if needed.
237 The configured udev_log value can be overridden with the environment variable
242 Possible use of a system-wide klibc:
243 make USE_KLIBC=true KLCC=/usr/bin/klcc all
244 will link against an external klibc and our own version will be ignored.
248 We support an unlimited count of symlinks now.
250 If USE_STATIC=true is passed to a glibc build, we link statically and use
251 a built-in userdb parser to resolve user and group names.
253 The PLACE= key is gone. It can be replaced by an ID= for a long time, cause
254 we walk up the chain of physical devices to find a match.
256 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
257 easy to skip certain attribute matches without composing rules with weird
258 character class negations like:
259 KERNEL="[!s][!c][!d]*"
260 this can now be replaced with:
262 The current simple '=' is still supported, and should work as it does today,
263 but existing rules should be converted if possible, to be better readable.
265 We have new ENV{}== key now, to match against a maximum of 5 environment
268 udevstart is its own binary again, cause we don't need co carry this araound
269 with every forked event.